package cn.jinjimi.app.main.widget;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.support.v4.content.ContextCompat;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;

import cn.jinjimi.app.R;

public class SideBar extends View {
    // 触摸事件
    private OnTouchingLetterChangedListener onTouchingLetterChangedListener;
    // 26个字母
    private String[] b = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "#"};
    private int choose = -1;// 选中
    private Paint paint = new Paint();

    private TextView mTextDialog;

    private int MAX_HEIGHT = 60;

    private int mOffY = 0;

    public void setTextView(TextView mTextDialog) {
        this.mTextDialog = mTextDialog;
    }

    public SideBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        MAX_HEIGHT = context.getResources().getDimensionPixelSize(R.dimen.dp_20);
    }

    public SideBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SideBar(Context context) {
        this(context, null);
    }

    /**
     * 设置索引字母
     *
     * @param chars
     */
    public void setIndexChars(String[] chars) {
        if (chars == null || chars.length == 0)
            setVisibility(GONE);
        else {
            this.b = chars;
            invalidate();
        }
    }

    /**
     * 重写这个方法
     */
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // 获取焦点改变背景颜色.
        int height = getHeight();// 获取对应高度
        int width = getWidth(); // 获取对应宽度
        int singleHeight = height / b.length;// 获取每一个字母的高度
        singleHeight = singleHeight > MAX_HEIGHT ? MAX_HEIGHT : singleHeight;

        mOffY = (height - b.length * singleHeight) / 2;

        for (int i = 0; i < b.length; i++) {
            paint.setColor(ContextCompat.getColor(getContext(), R.color.common_bg));
            // paint.setColor(Color.WHITE);
            paint.setTypeface(Typeface.DEFAULT_BOLD);
            paint.setAntiAlias(true);
            paint.setTextSize(getResources().getDimensionPixelSize(R.dimen.dp_9));
            // 选中的状态
            if (i == choose) {
                paint.setColor(Color.parseColor("#000000"));
                paint.setFakeBoldText(true);
                paint.setTextSize(getResources().getDimensionPixelSize(R.dimen.dp_14));
            }
            // x坐标等于中间-字符串宽度的一半.
            float xPos = width / 2 - paint.measureText(b[i]) / 2;
            float yPos = mOffY + singleHeight * i + singleHeight;
            canvas.drawText(b[i], xPos, yPos, paint);
            paint.reset();// 重置画笔
        }

    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        final int action = event.getAction();
        final float y = event.getY() - mOffY;// 点击y坐标
        final int oldChoose = choose;
        final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;
        final int c = (int) (y / (getHeight() - 2 * mOffY) * b.length);// 点击y坐标所占总高度的比例*b数组的长度就等于点击b中的个数.

        switch (action) {
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                setBackgroundColor(Color.TRANSPARENT);
                choose = -1;

                invalidate();
                if (mTextDialog != null) {
                    mTextDialog.setVisibility(View.INVISIBLE);
                }
                break;

            default:
                // 设置右侧字母列表[A,B,C,D,E....]的背景颜色
                setBackgroundColor(ContextCompat.getColor(getContext(), R.color.transparent_10));
                if (oldChoose != c) {

                    if (c >= 0 && c < b.length) {
                        if (listener != null) {
                            listener.onTouchingLetterChanged(b[c]);
                        }
                        if (mTextDialog != null) {
                            mTextDialog.setText(b[c]);
                            mTextDialog.setVisibility(View.VISIBLE);
                        }

                        choose = c;
                        invalidate();
                    }
                }

                break;
        }
        return true;
    }

    /**
     * 向外公开的方法
     *
     * @param onTouchingLetterChangedListener
     */
    public void setOnTouchingLetterChangedListener(OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
        this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
    }

    /**
     * 接口
     *
     * @author coder
     */
    public interface OnTouchingLetterChangedListener {
        void onTouchingLetterChanged(String s);
    }

}